Dynamo-electric machine



(No Model.)

J` OLIVISTED.

DYEAMO ELECTRIC MACHINE. No. 290,098. Patented Dec. l1, 1883.

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Unrrnn Sterns PATENT trice.,

JOSEPH OLMSTED, OF NEV YORK, N. Y., ASSIGNOR TO THE OLMSTED ELECTRIC LIGHT AED POVER COMPANY, OF SAME PLACE.

DYNAMO-ELECTRIC MACHINE.

SIPECIFICATION forming part of Letters Patent No..290,093, dated December ll, 1888.

l Application filed September 7, 188i. (No model.)

To a/ZZ whom, t 71Min/ concern.-

Be it knownthat I, JosnPH OLitsrnD,of X ew York, in the county and State of New York, haveinvented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification, reference being had to the drawings accompanying, forming a part thereof.

My invention consists in the combination, with an armature wound with a system ot' coils connected up to form one continuous conductor, of a commutator havingtwo rows or sets of plates equal in number to the coils on the armature, and alternately connected with the same by means of connecting-wires brought from the loops or portions oi' conductor intervening between any two adjacent coils.

In mechanical construction the form of commutator which I employ resembles that otl others heretofore used in the construction of dynamo-electric machines, but under radically different conditions from those that my invention implies. For example, commntators with plates alternately disposed have been used in conjunction with a system of inde` pendent armature-coils, the opposite ends of which were connected to diametrically-opposite commutator-plates, such machines being what are known as open-circuit machines,77 and requiring two commutator-plates for each coil. In my improved machine, however, the armature is wound with a number ot' coils, which are connected -up end to end to form a continuousconductor, from which connections are made with the connnutator-segments by lo'ops or ends taken off from the junctions of the original by independent coils. This system of winding and connecting` requires as many segments on the commutator as there are coils on the armature, so that when the number of coils is large, the segments, as ordinarily made, are required to be very narrow, as also are the spaces between them. From this arises a serious difficulty-that of shortcircuiting the coils-which is liable to occur wheneverany two adjacent commutator-plates orsegments are bridged over, as by particles of metal worn from the brushes or otherwise. This, mainly, it is my object to avoid, and for this purpose I combine with an armature,

whether cylindrical or annular, and wound wit-h conductors connected to form a closedcircuit machine, as above stated, a commutator composed of a ring or collar of insulating material, around the surface of which are screwed or set two rows ot' alternately-dis` posed plates. It will be understood that other advantages than those named are gained by this meansfor instance, the possibility of removing the plates should occasion require, and other advantages incident to this plan of mechanical construction.

In the accompanying drawings, I have illustrated the invention as embodied in a machine ot` special construction, and for a more specific statement ot the invention reference is made tothe same.

Figure l represents in elevation the commutator complete, Fig. 2, a cross-section ot' the same 5 and Fig. 3, a diagrammatic illustration of the principle ot' construction, and the method of connecting the same with the armature.

A is the shaft of thc machine, upon which the armature is iXed, and by which also the commutator is designed to be carried.

B is a collar ot' insulating material-such as ebonite, cement, or hard rubber suitably sccured to the shaft. bis a ridge or iiange on the said collar, which may be omitted, if so dcsired, as it serves simply as a dividing-line between the two rows or sets ot' plates.

C C represent the plates or segments, which are composed ot' brass, and secured to the eollar B by screws c c, aspaee being left between, which may be lilled with an insulating material, if so desired. The plates of one row or set are secured to the collar in such a manner as to lie opposite the spaces between the others, as shown.

l) D are wires leading to the strips, the former connecting directly to the inside row, or that nearest the armature, the latter passing through the insulating collar to the other or outside row. The plan of the connections is illustrated in Fig. 3, where E E represent the severai armature-coils. Between one coil and its next adjacent coil aloop is formed, which is carried out and connected to one, say, of the inside row ot' plates, the next loop IOO 2 locales is connected to the neXt adjacent strip of the the conibination,with an armature wound with outside set, and this plan is continued until va continuous system of coils, of a eommutator all the strips are connected with the loops or having plates equal in number to the coils on ends, the latter being carried from one row to the armature, the plates being disposed in two 15 5 the other alternately, until one half of the sets or rows, and alternately connected with loops connect with one set, the other with the the loops or portions of conductor joining the other. coils, as set forth.

Having now described my invention, what JOSEPH OLMSTED. l claim as new, and desire to secure by Letters Witnesses: 1o Patent, is- I PARKER W. PAGE,

W. FRIsBY.

In a dynamo or magneto electric machine, 

